#include <pthread.h>
#include <unistd.h>
// #include <stdlib.h>
// #include <string.h>
#include <cstdio>
// 锁的使用
pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
// 共享资源
int ticket = 1000;

void *routine(void *args)
{
    // 多个线程同时卖票（访问共享资源）
    while (true)
    {
        pthread_mutex_lock(&lock); // 申请锁
        if (ticket > 0)
        {
            usleep(1000);
            ticket--;
            printf("%s sells ticket:%d\n", (char *)args, ticket);
            pthread_mutex_unlock(&lock);
            usleep(1000);
        }
        else
        {
            pthread_mutex_unlock(&lock);
            usleep(1000);
            break;
        }
    }
    return nullptr;
}

int main()
{
    pthread_t t1, t2, t3, t4;
    pthread_create(&t1, nullptr, routine, (void *)"thread-1");
    pthread_create(&t2, nullptr, routine, (void *)"thread-2");
    pthread_create(&t3, nullptr, routine, (void *)"thread-3");
    pthread_create(&t4, nullptr, routine, (void *)"thread-4");

    pthread_join(t1, nullptr);
    pthread_join(t2, nullptr);
    pthread_join(t3, nullptr);
    pthread_join(t4, nullptr);
}